Citazione APA

Onkar singh et al. (1993). Frontiers in environmental geography. Concept Publishing Company.

Stile di citazione Chicago

Onkar singh et al. Frontiers in Environmental Geography. New Delhi: Concept Publishing Company, 1993.

Citazione MLA

Onkar singh et al. Frontiers in Environmental Geography. Concept Publishing Company, 1993.

Attenzione: Queste citazioni potrebbero non essere precise al 100%.